動体検知

by ton 01 Dec 2010

• Forked from ton's 背景差分 元画像 background sbtraction original
• Diff: 11
• Related works: 3
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package {
    import com.bit101.components.HUISlider;
    import com.bit101.components.Label;
    import flash.display.*;
    import flash.events.Event;
    import flash.geom.Point;
    import flash.media.Camera;
    import flash.media.Video;
    import flash.system.Security;
    import net.hires.debug.Stats;

    /**
     * 背景差分ときたら動体検知
     * 
     * うーん、環境と閾値次第だなぁ
     * 
     * スライダーで閾値を調節できます
     * @author ton-up.net
     */
    [SWF(frameRate=10)]
    public class BackgroundSubtraction extends Sprite {
        private const BG_COLOR:uint = 0xFFFFFFFF;
        private const DIFF_COLOR:uint = 0xFF000000;
        private const DEFAULT_THRESHOLD:uint = 0x30;

        private var video:Video;
        private var bgBmd:BitmapData;
        private var nowBmd:BitmapData;
        private var p:Point = new Point();
        private var slider:HUISlider;
        private var threshold:uint;
        
        public function BackgroundSubtraction():void {
            Security.allowDomain("*");
            var camera:Camera = Camera.getCamera();
            if (!camera) {
                new Label(this, 10, 10, "can't use camera");
                return ;
            }
            
            camera.setMode(stage.stageWidth, stage.stageHeight, 30);
            video = new Video(camera.width, camera.height);
            video.attachCamera(camera);
            
            bgBmd = new BitmapData(video.width, video.height, false);
            nowBmd = new BitmapData(video.width, video.height, false);
            
            addChild(new Bitmap(nowBmd));
            
            addChild(new Stats());

            slider = new HUISlider(this, 100, 10, "threshold", setThreshold);
            slider.setSliderParams(0, 0xFF, DEFAULT_THRESHOLD);
            slider.tick = 1;
            
            setThreshold();
            
            addEventListener(Event.ENTER_FRAME, update);
        }
        
        private function setThreshold(e:Event = null):void {
            var v:uint = slider.value;
            threshold = 0xFF000000 | v << 16 | v << 8 | v;
        }

        private function update(e:Event):void {
            nowBmd.draw(bgBmd);
            nowBmd.draw(video, null, null, BlendMode.DIFFERENCE);
            nowBmd.threshold(nowBmd, nowBmd.rect, p, "<=", threshold, BG_COLOR);
            nowBmd.threshold(nowBmd, nowBmd.rect, p, "!=", BG_COLOR, DIFF_COLOR);
            
            bgBmd.draw(video);
        }
    }
}